Move the remaning base/process* files into base/process/.

base/process_linux.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/process.h"
-
-#include <errno.h>
-#include <sys/resource.h>
-
-#include "base/file_util.h"
-#include "base/lazy_instance.h"
-#include "base/logging.h"
-#include "base/strings/string_split.h"
-#include "base/strings/stringprintf.h"
-#include "base/synchronization/lock.h"
-
-namespace {
-const int kForegroundPriority = 0;
-
-#if defined(OS_CHROMEOS)
-// We are more aggressive in our lowering of background process priority
-// for chromeos as we have much more control over other processes running
-// on the machine.
-//
-// TODO(davemoore) Refactor this by adding support for higher levels to set
-// the foregrounding / backgrounding process so we don't have to keep
-// chrome / chromeos specific logic here.
-const int kBackgroundPriority = 19;
-const char kControlPath[] = "/sys/fs/cgroup/cpu%s/cgroup.procs";
-const char kForeground[] = "/chrome_renderers/foreground";
-const char kBackground[] = "/chrome_renderers/background";
-const char kProcPath[] = "/proc/%d/cgroup";
-
-struct CGroups {
-  // Check for cgroups files. ChromeOS supports these by default. It creates
-  // a cgroup mount in /sys/fs/cgroup and then configures two cpu task groups,
-  // one contains at most a single foreground renderer and the other contains
-  // all background renderers. This allows us to limit the impact of background
-  // renderers on foreground ones to a greater level than simple renicing.
-  bool enabled;
-  base::FilePath foreground_file;
-  base::FilePath background_file;
-
-  CGroups() {
-    foreground_file =
-        base::FilePath(base::StringPrintf(kControlPath, kForeground));
-    background_file =
-        base::FilePath(base::StringPrintf(kControlPath, kBackground));
-    file_util::FileSystemType foreground_type;
-    file_util::FileSystemType background_type;
-    enabled =
-        file_util::GetFileSystemType(foreground_file, &foreground_type) &&
-        file_util::GetFileSystemType(background_file, &background_type) &&
-        foreground_type == file_util::FILE_SYSTEM_CGROUP &&
-        background_type == file_util::FILE_SYSTEM_CGROUP;
-  }
-};
-
-base::LazyInstance<CGroups> cgroups = LAZY_INSTANCE_INITIALIZER;
-#else
-const int kBackgroundPriority = 5;
-#endif
-}
-
-namespace base {
-
-bool Process::IsProcessBackgrounded() const {
-  DCHECK(process_);
-
-#if defined(OS_CHROMEOS)
-  if (cgroups.Get().enabled) {
-    std::string proc;
-    if (file_util::ReadFileToString(
-        base::FilePath(StringPrintf(kProcPath, process_)),
-        &proc)) {
-      std::vector<std::string> proc_parts;
-      base::SplitString(proc, ':', &proc_parts);
-      DCHECK(proc_parts.size() == 3);
-      bool ret = proc_parts[2] == std::string(kBackground);
-      return ret;
-    } else {
-      return false;
-    }
-  }
-#endif
-  return GetPriority() == kBackgroundPriority;
-}
-
-bool Process::SetProcessBackgrounded(bool background) {
-  DCHECK(process_);
-
-#if defined(OS_CHROMEOS)
-  if (cgroups.Get().enabled) {
-    std::string pid = StringPrintf("%d", process_);
-    const base::FilePath file =
-        background ?
-            cgroups.Get().background_file : cgroups.Get().foreground_file;
-    return file_util::WriteFile(file, pid.c_str(), pid.size()) > 0;
-  }
-#endif // OS_CHROMEOS
-
-  if (!CanBackgroundProcesses())
-    return false;
-
-  int priority = background ? kBackgroundPriority : kForegroundPriority;
-  int result = setpriority(PRIO_PROCESS, process_, priority);
-  DPCHECK(result == 0);
-  return result == 0;
-}
-
-struct CheckForNicePermission {
-  CheckForNicePermission() : can_reraise_priority(false) {
-    // We won't be able to raise the priority if we don't have the right rlimit.
-    // The limit may be adjusted in /etc/security/limits.conf for PAM systems.
-    struct rlimit rlim;
-    if ((getrlimit(RLIMIT_NICE, &rlim) == 0) &&
-        (20 - kForegroundPriority) <= static_cast<int>(rlim.rlim_cur)) {
-        can_reraise_priority = true;
-    }
-  };
-
-  bool can_reraise_priority;
-};
-
-// static
-bool Process::CanBackgroundProcesses() {
-#if defined(OS_CHROMEOS)
-  if (cgroups.Get().enabled)
-    return true;
-#endif
-
-  static LazyInstance<CheckForNicePermission> check_for_nice_permission =
-      LAZY_INSTANCE_INITIALIZER;
-  return check_for_nice_permission.Get().can_reraise_priority;
-}
-
-}  // namespace base